United Nations Secretary-General António Guterres said in a year-end message on Monday that "we have no time to lose" in the face of the worsening global climate crisis, which pushed temperatures to a record high this year and supercharged deadly extreme weather around the world.
"Today, I can officially report that we have just endured a decade of deadly heat," Guterres said in a video message posted to social media. "The top 10 hottest years on record have happened in the last 10 years, including 2024."
“This is climate breakdown in real time. We must exit this road to ruin," he continued. "In 2025, countries must put the world on a safer path by dramatically slashing emissions and supporting the transition to a renewable future. It is essential—and it is possible."
Guterres' call to action came in the waning days of what scientists say is almost certain to be the hottest year on record and the first full year to breach the critical 1.5°C temperature threshold.
Celeste Saulo, secretary-general of the World Meteorological Organization (WMO), echoed Guterres' warning about the dire consequences of the status quo, saying in a statement Monday that "if we want a safer planet, we must act now."
"It's our responsibility. It's a common responsibility, a global responsibility," Saulo said. "Every fraction of a degree of warming matters, and increases climate extremes, impacts, and risks. Temperatures are only part of the picture. Climate change plays out before our eyes on an almost daily basis in the form of increased occurrence and impact of extreme weather events."
Last month, with emissions continuing to surge as the rich nations most responsible for the climate emergency refuse to ditch fossil fuels, world leaders convened for a U.N. climate summit in Azerbaijan that was swarmed by oil and gas lobbyists. The key gathering ended with a deal that climate advocates described as a step backward in the necessary push to rein in fossil fuel emissions.
Climate-denier and fossil fuel booster Donald Trump's looming return to office in the U.S.—the world's largest historical emitter—has campaigners and scientists increasingly concerned about the future of existing global climate agreements such as the Paris accord, from which the president-elect has pledged to withdraw once again.
One recent analysis projected that a second Trump administration could unleash an additional 4 billion tonnes of carbon dioxide equivalent by 2030, which would inflict $900 billion in global climate damages and deal a devastating blow to efforts to forestall runaway warming.
Throughout 2024, Guterres used his role as head of the U.N. to sound the alarm about the world's dangerous trajectory, saying in an October address that "there is a direct link between increasing emissions and increasingly frequent and intense climate disasters."
"We're playing with fire," he said, "but there can be no more playing for time."